That the city was named after Bruno of Cologne and the Montarville seigneury. The name "Montarville" is a homonym of a village of Eure-et-Loir in France: Montharville, whose etymology is uncertain. The name was written in its Latin form, Mons Harvilla in the 12th century[5] – in other words "Haric's farm's mount", a name of Germanic origins also found in Harville (Hairici villa, 9th century). However, this uncommon composition of a Roman appellation ("mont") associated with the Norman toponymy "-ville" place name casts doubts on this explication. It could be the name of an unidentified Germanic individual.

Quebec's toponymy commission suggests another hypothesis to explain the origin of the city's namesake. "Montarville" could be a portmanteau of "montagne" (French for mountain) and "Boucherville" after Pierre Boucher de Boucherville, the region's first seigneur. The hypothesis rests on the fact that the descendants of de Boucherville were named Montarville, Niverville, etc. The patron saint of the city could be explained by the sale of the seigneury to François-Pierre Bruneau, whose name was slightly transformed.[1]

The ownership remained in the Boucher family until 1829, when René Boucher de la Bruère sold half his land and his rights as a seigneur to François-Pierre Bruneau of Montréal. He died in 1851 and his brother Oliver-Théophile Bruneau (who was the first professor of anatomy at McGill University), was the last seigneur of Montarville from 1851 until the seigneural system was abolished in 1854.[6]

While agriculture was the primary subsistence and economical activity of the region, the seigneury of Montarville, thanks to its proximity to Mount Saint-Bruno, benefited much from the industrial activity that developed around the hydraulic power it could harvest from the mountain's many ponds and streams. The first water mill was erected in 1725 and in the 19th century, they numbered six in the territory and permitted such activities as grinding grain, milling wood, tanning leather and carding and spinning wool.[7]

The 19th century also saw the diversification of the seigneury's agricultural activities trough increased animal husbandry, orchards, and maple syrup collection.[7]

At the beginning of the 19th century, families residing on the western flank of the mountain were under the clerical responsibility of the parish of Boucherville while families from the southern flank were under the responsibility of the parish of Saint-Joseph de Chambly. As a consequence, the tithe was being paid to two different parishes, so in 1809 a first request to transform the seigneury into a parish was made to MgrJoseph-Octave Plessis, Archbishop of Quebec. This request was met with a refusal. It would be thirty-three years before the Montarvillans attempted to form into their own parish again.[7]

It is worth mentioning that in 1838 during the Patriotes Rebellion, François-Pierre Bruneau's manor was occupied by the Patriotes and that one of them, André Proteau, was from the seigneury.

In 1842, a petition totaling about sixty signatures was presented to MgrIgnace Bourget, Bishop of Montreal who agreed to the demand, and in the same year he signed a canonical decree officiating the creation of the parish of Saint-Bruno. François-Pierre Bruneau was honored with the choice of the titular saint, Saint Bruno.

In line with the Durham Report's recommendation to elaborate municipal structures in 1840 (culminating in the abolition of the seigneury system in 1854) and the Acte pour abroger certaines ordonnances et pour faire de meilleures dispositions pour l'établissement d'autorités locales et municipales dans le Bas-Canada (Act to abrogate certain ordinances and to make better dispositions to establish local and municipal authorities in Lower-Canada), on 1 July 1845 the Canadian Parliament created more than 325 municipal corporations in eastern Canada of which Saint-Bruno, then with a population of 800, was a part. The following year on the 9th of October 1846, the parish municipality of Saint-Bruno was born through an official proclamation.

For a few years, Saint-Bruno remained part of the municipality of Chambly but in 1855, as mandated by the Loi constituant en municipalités toutes paroisses de plus de 300 personnes (Law making into a municipality every parish of more than 300 persons), the parish municipality became fully autonomous and its two names, "Saint-Bruno" and "Montarville", were joined into the designation we still use to this day.[6]

In 2000, the Parti Québécois governments of Lucien Bouchard and Bernard Landry introduced a series of legislative measures with the intent of reorganizing and merging many of Quebec's municipalities. In 2002, following the adoption of bill 170, Saint-Bruno merged with other municipalities on Montreal's south shore to form the city of Longueuil. Following public outcry and a referendum, the city demerged from Longueuil and was reconstituted on January 1, 2006, but remained within the agglomeration of Longueuil, which remains responsible for a series of services to the population.[8][9]

The 2006 census found that about 85% of residents spoke French as a mother tongue (including persons who had more than one mother tongue), and that about 11% of residents spoke English as a mother tongue (also including persons who had more than one mother tongue). The next most common mother tongue was Italian.[13]